GitBook is described as «tool for building beautiful books using Git and Markdown. It can generate your book into multiple formats:» and is a documentation generator in the development category. There are more than 50 alternatives to GitBook for a variety of platforms, including Linux, Mac, Self-Hosted solutions, Windows and Online / Web-based. The best alternative is Archbee, which is free. Other great apps like GitBook are BookStack, DokuWiki, Wiki.js and Slite.GitBook alternatives are mainly Documentation Generators but may also be Static Site Generators or Team Collaboration Tools. Filter by these if you want a narrower list of alternatives or looking for a specific functionality of GitBook.